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dlaswp

 NAME
      DLASWP - perform a series of row interchanges on the matrix
      A

 SYNOPSIS
      SUBROUTINE DLASWP( N, A, LDA, K1, K2, IPIV, INCX )

          INTEGER        INCX, K1, K2, LDA, N

          INTEGER        IPIV( * )

          DOUBLE         PRECISION A( LDA, * )

 PURPOSE
      DLASWP performs a series of row interchanges on the matrix
      A.  One row interchange is initiated for each of rows K1
      through K2 of A.

 ARGUMENTS
      N       (input) INTEGER
              The number of columns of the matrix A.

      A       (input/output) DOUBLE PRECISION array, dimension (LDA,N)
              On entry, the matrix of column dimension N to which
              the row interchanges will be applied.  On exit, the
              permuted matrix.

      LDA     (input) INTEGER
              The leading dimension of the array A.

      K1      (input) INTEGER
              The first element of IPIV for which a row inter-
              change will be done.

      K2      (input) INTEGER
              The last element of IPIV for which a row interchange
              will be done.

      IPIV    (input) INTEGER array, dimension (M*abs(INCX))
              The vector of pivot indices.  Only the elements in
              positions K1 through K2 of IPIV are accessed.
              IPIV(K) = L implies rows K and L are to be inter-
              changed.

      INCX    (input) INTEGER
              The increment between successive values of IPIV.  If
              IPIV is negative, the pivots are applied in reverse
              order.